package com.itheima.service;

import com.alibaba.dubbo.config.annotation.Reference;
import com.itheima.domain.Permission;
import com.itheima.domain.Role;
import com.itheima.domain.User;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Component;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;

/**
 * @PackageName: com.itheima.service
 * @ClassName: SpringSecurityUserService
 * @Author: Solomon
 * @Date: 2020/7/14 23:38
 * @Description:
 */
@Component
public class SpringSecurityUserService implements UserDetailsService {

    @Reference
    private UserService userService;

    //根据用户名查询数据库获取用户所有信息(基本信息，角色，权限)
    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        User user = userService.findUserByUsername(username);
        if (user == null){
            //用户名不存在
            return null;
        }

        //用户角色权限集合
        List<GrantedAuthority> list = new ArrayList<>();

        //动态为当前用户授权
        Set<Role> roles = user.getRoles();
        //遍历角色集合，为用户授予权限
        for (Role role : roles) {
            //使用的是角色的关键字，为用户授予角色
            list.add(new SimpleGrantedAuthority(role.getKeyword()));
            //权限集合
            Set<Permission> permissions = role.getPermissions();
            for (Permission permission : permissions) {
                //为用户添加权限
                list.add(new SimpleGrantedAuthority(permission.getKeyword()));
            }
        }

        return new org.springframework.security.core.userdetails.User(username,user.getPassword(),list);
    }
}
